If you are traveling ________ the customs are really foreign to your own，please do as the Romans do.
| A．in which | B．what |
| C．when | D．where |
28. You can’t complain of being lonely____you don’t make any effort to communicate with others.
| A．when | B．until | C．unless | D．Once |
27. The boy was busy doing his homework, only_____once in a while to look out of the window.
| A．stopping | B．to stop | C．stopped | D．having stopped |
26. You will be at a(n)_____if you have thought about the interview questions in advance in application for a job.
| A．favor | B．advantage | C．benefit | D．profit |
25. Life insurance is not really betting although it can be compared to it.You pay the money just _______.
| A．in time | B．in case | C．in return | D．in honor |
24. — Hello, everyone! Have you heard the meeting will be put off?
— Yeah, that’s what we about when you came in.
| A．were talking | B．are talking | C．have talked | D．had talked |